[neonixie-l] Re: Looking for 3 or 4 NL807/821 tubes

Still looking for some NL807/NL821 or equivalents if anybody has any? Thanks, Nick On Thu, Sep 4, 2014 at 1:32 PM, Nicholas Stock nickst...@gmail.com wrote: Anybody have some of these they're willing to sell/trade? PM me. Thanks, Nick -- You received this message because you are

[neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

Hi folks, I want to adjust the output voltage of the Taylor Edge HVPS 1363 [1] digitally via a microcontroller. I drive the HVPS with 12V to have maximum output current. I know that I could just select the voltage with a couple of switches and resistors, but is there a way to do that

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

On 9/7/14 9:53 AM, jb-electronics wrote: Hi folks, I want to adjust the output voltage of the Taylor Edge HVPS 1363 [1] digitally via a microcontroller. I drive the HVPS with 12V to have maximum output current. I know that I could just select the voltage with a couple of switches and

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

On Sun, Sep 7, 2014 at 12:53 PM, jb-electronics webmas...@jb-electronics.de wrote: Hi folks, I want to adjust the output voltage of the Taylor Edge HVPS 1363 [1] digitally via a microcontroller. I drive the HVPS with 12V to have maximum output current. I know that I could just select the

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

Jens, Two things: 1. Make sure you know the maximum voltage on that resistor adjust pin, and select the control chip accordingly. 2. The control will be non-linear no matter what, so use a lookup table to convert desired voltage to the resistor switch or digital pot value or whatever.

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

Thanks. I will do some experiments. In the meantime I relaized that a logarithmic 47k potentiometer can be used to mimick a reasonably linear behaviour between 170V..200V in terms of the adjusted potentiometer angle. This is not digital of course, but fun to imagine. Jens Am 07.09.2014

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

Hi, jb-electronics wrote: I want to adjust the output voltage of the Taylor Edge HVPS 1363 [1] digitally via a microcontroller. I drive the HVPS with 12V to have maximum output current. If I understand it correctly, the output voltage is a function of the resistor R_Adjust and the voltage

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

If I understand it correctly, the output voltage is a function of the resistor R_Adjust and the voltage it is connected to, V_Radjust. It seems that chosing the resistor for maximum output voltage (0 Ohms) and then increasing the voltage decreases the output voltage, so it might be possible

Re: [neonixie-l] How to digitally adjust output voltage of Taylor Edge HVPS 1363

Hi, John Rehwinkel wrote: I suspect that wouldn't work the way you want. I think that resistor parallels part of the voltage divider in the feedback loop. By introducing a separate voltage, you would reduce the sensitivity of the feedback loop and thereby produce poorer regulation.